| XV workshop | September 21 - 23, 2011 | |
| XIV workshop | September 2 - 4, 2008 | |
| XIII workshop | September 20 - 22, 2006 | |
| XII workshop | September 29 - October 1, 2004 | |
| XI workshop | September 26 - 28, 2002 | |
| X workshop | September 25 - 27, 2000 | |
| IX workshop | September 28 - 30, 1998 | |
| VIII workshop | September 25 - 27, 1996 | |
| VII workshop | March 28 -30, 1994 | |
| VI workshop | April 5 - 8, 1993 | |
| V workshop | April 13 - 15, 1992 | |
| IV workshop | March 25 - 28, 1991 | |
| III workshop | April 9 - 11, 1990 | |
| II workshop | March 20 - 22, 1989 | |
| I workshop | March 28 - 30, 1988 |